THE LONG-TERM H$\alpha$ EMISSION LINE VARIATION IN $\alpha$~Eri
Résumé
The long-term variation of the H$\alpha$ line in $\alpha$~Eri has 14-15 years cyclic \bbe phase transitions. The disc formation time scales, interpreted as the periods during which the H$\alpha$ line emission increases from zero to its maximum, agree with the viscous decretion model. On the other hand, the time required for the disc dissipation ranges from 6 to 12 years which questions the viscous disc model predictions.
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